Purpose: Bone stock the WRX is one of the best performing 25k cars you can find, but there's always room for improvement. Replacing the stock 2.25" exhaust and it's 2 catalytic converters with a 3" turbo-back exhaust, featuring one high flow cat, should allow the turbo to spool up easier and quicker for more low end grunt. Another benefit is the super quiet stock exhaust tone should be replaced with a more sporting tone. Along with these goals of performance and aural enhancement, we also wanted to keep the sleeper look our wagon bodied WRX affords. Lucky for us M2 Performance had just the ticket, a 3" turbo back exhaust with a dual tip muffler. M2 originally specialized in Mazda's only, but with the release of the WRX in the states, M2 has jumped into the WRX market with a vengeance and has already built up a good reputation within the Subaru community. The look of the M2 system is so close to stock that your local racer might not be able to tell the difference. For those of you who want a more obvious look, 4 and 5" single tip mufflers are also available.
Disclaimer: Perform this installation at your own risk. We do not assume any responsibility whatsoever for any damages of any kind resulting from any information printed in this article. This article was created as a supplementary resource and should not be used as the lone source of information on this topic. We recommend that you seek the advice of a trained professional. This is simply a guide to show users how we accomplished our own installations for our Project Car.
A few tips for installation: 1. Make sure the vehicle has had sufficient time to cool down. We allowed our WRX to cool off for 3 hours with the hood up and it was still very warm to the touch! 2. Gather all tools you'll need before you begin. 3. Spray all bolts with a lubricant such as LiquidWrench or WD40 and allow to penetrate for about an hour. 5. Use protective eye wear. Our tools consisted of a socket set, box end wrenches, an adjustable wrench, wire crimpers and some wire snips.
M2 3-inch Stainless Steel Turbo-Back Exhaust System
Step 1: Remove the heatshield. You'll be amazed at the amount of bolts used to hold on this simple piece of metal. There are 5 on the left side (viewing from the front of the car), one on the back, and two on the right side. After you have all the bolts removed you're going to need some keen geometry skills to get the heat shield out of the engine bay but once you do, the downpipe to turbo connection is easily available. Once the downpipe is exposed look for the bottom heatshield. It connects to the downpipe by one bolt.